Cross Sum is a mathematical puzzle where you must enter each of the numbers from 1-9 in the blank spaces on the grid to simultaneously satisfy six different sums.

### How to play

Use the number clues in the rows and columns and deduce which numbers go in which squares. Only the numbers 1-9 can be used and can each be used once.

**IMPORTANT: Please note that the operations in each sum ( + , - , × , ÷ ) are always applied left-to-right or top-to-bottom, rather than in the normal order of operator precedence.**

Tap on a grid square to select it, then use the keypad buttons below the grid to enter numbers.

The top row of buttons enter numbers in

**pen**(indicating that they're part of the final answer). The bottom row allow you to enter numbers in*pencil*, to help keep track of which numbers are still valid for that square.You can erase numbers you've entered by reselecting the square you want to edit, and using the keypad buttons to 'switch off' (erase) entered numbers.

### Extra help

If you're stuck on a Cross Sum puzzle, you can use coins to buy hints.

Hints can be used by tapping on the relevant icon in the status bar area at the top of the screen.

The cost (in coins) to use each hint is printed under its icon.

**■ Solve Cell**

Use this hint to automatically put the right number into the selected cell only.

**■ Show Pencil Numbers**

Use this hint to fill in all pencil marks showing which possible numbers are valid in each location.

**■ Check for Errors**

Use this hint to highlight all the cells with incorrect values.